Dust-collector



(No Model.) '2 Sheets-Sheet 1.

D. A. WARD. DUST COLLECTOR.

No. 450,269. PatentedApr. 14,1891.

(No Model.)

2 Sheets-Sheet 2. D. A. WARD.

DUST COLLECTOR.

Patented Apr. 14, 1 891.

we. my.

TME NORRIS versus 00., FMn'm-u'm UNITE STATES DAVID A. \VARD, OF IVARSAIV, ILLINOIS.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters Patent No. 450,269, dated April 14, 1891.

Application filed September 18, 1890 Serial No. 865,384:- (No model.)

To all whom it may concern:

Be'it known that I, DAVID A. WARD, of Varsaw, in the county of Hancock and State of Illinois, have invented certain Improvements in Dust-Collectors, of which the followin g is a specification.

My invention relates to d list-collectors espepecially adapted for use in connection with the discharge-spouts of roller-mills and with the air-exhaust pipes leading therefrom.

The object of my invention is to provide a dust-collectorof a simple cheap construction, which maybe easily applied and easily cleaned after a period of use.

To this end my invention consists in constructions and combinations hereinafter described, and particularly pointed out in the claims.

My invention will be more readily understood by reference to the accompanying drawings, in which Figure 1 is a side elevation of my novel dust-collector, portions of the same being broken away to show the construction of the device. Fig. 2 is a sectional elevation of Fig. 1, taken upon the line 00 5c of the same. Fig. 3 shows a special application of my dust-collector.

As shown in the drawings, my dust-collector consists of two frames 18 and 19, conneeted together by the flexible strips 20, running clear around the inner sides of the frames 18 and 19 and closing the opening between the adjacent edges of the frame. These frames are retained in position against lateral movement by suitable pins 22 and 23, secured in the lower frame and adapted to work in. suitable slots in the upper frame, as indicated by the dotted lines in the sectioned portion of Fig. 1. The frames are normally held apart by suitable springs 24 and 25, provided between suitable side bars 26 and 27, placed upon the lower and upper frames, respectively. By placing these springs upon the side bars the springs are removed from possible contact with the cloth-strip 20, when the two sections are pressed together and the folds of the cloth are pressed out.

The cross-rods 28 and 29 are provided between the sides of the lower and upper frames and are placed, preferably, at equal distances from one another and clear across the length of the box, as shown in Fig. 1. The sievecloth 30, preferably flannel, is carried alternately over the upper and lower rods 28 and 29. The edges of the piece of cloth are preferably glued to the sides of the frames and to the strips 20, so as to form a complete bar to the passage of dust. constructed the sieve of separate bags, the apex of each being supported by bars similar to the bars 29, while the mouths of the bags were held between bars like the bars 28. By so convoluting the sieve-cloth it is seen that a very large surface of the same is provided within a small area, thus giving the dust-collector a greater capacity than if only a simple horizontal diaphragm of sieve-cloth were used. The top of the upper frame 18 is closed by snitable'box and cover 3]., provided with the outlet-opening 32, leading to the exhaustfan. A suitable hopper-bottom 33 is provided in connection with the lower frame, said hopper being provided with a suitable inlet-opening 34, adapted to coincide with the opening through which the air-current passes into the (lust-collector. The current of air will be exhausted from the trough and drawn through the opening 34 into the main body of the dust-collector, where the air will pass through the fine meshes of the convoluted sieve 30 and pass on out through the top of thedust-collector and into theopen air through the suction-fan. The dust, middlings, or other fine stock drawn through the opening 34 by the rapidly-moving current of air will be caught by the sieve-cloth 30 and will either drop back into the hopper or be retained in the sieve-cloth. From the hopper 34 the stock thus deposited will drop quickly and quietly into the trough leading to the elevator. When the sieve-cloth has become filled or choked with material, it may be easily cleared out by first shutting off the draft through the collector. This may be done, as shown in Fig. 3, by closing the valve 40 and striking the upper part of the frame, which will slacken up the cloth between the upper and lower rods 28 and 29 and jar out the material held therein. I preferably provide a stout cross-rod 35 above the top or roof of the dust-collector and supported upon the side blocks 36, provided upon the upper frame 18, the blows being struck upon this rod instead of on top of the I have sometimes dust-collector. The shaking ol the dust would be done both by the forcing down of the upper frame when a blow was struck on the bar 35 and by the sharp recoil of the frame and the tautening of the cloth stretching between the rods 28 and 29.

In Fig. 3 I have illustrated one important use to which my dust-collector is applicable.

It is usual in flour-mills to connect all suc- Lion-pipes running from the several rollermills with one large dust-collector or separation-chamber. The great objection to this arrangement is that all grades of fiou r and middlings are carried off by the air-currents employed for cooling the rolls and mixed together in the one separation-chamber, from thence necessarily going into a low grade of flour. If all of the grades are kept separate, the firstclass middlings are eventually put into the first-class flour and the lower grades into a correspondingly low grade of flour, thereby greatly increasing the market value of a given amount of stock. Iaccomplish this individual separationbyprovidingone of the dust-collectors in connection with the discharge spoutti 7 of each roller-mill 2 3, as shown in Fig. 3. A shoulder or angle box l0 11 is built on each spout 6 7 and an opening it made in the top of the same, through which air passes into the dust-collector from the tops of the several collectors. Pipes 15 lead to a common suction-fan 17, through which the air first drawn into the mill-casings to cool and dry the rolls therein is eventually discharged free from 1 any dust which may have first been taken up i in the mills or spouts. All of the dust collected by the dust-collectors falls back into I the spouts beneath them, and thence passes l into the elevators S 9 and to the other parts l of the flour-mill. l Having thus described my invention, 1 claim as new and desire to secure by Letters Patent l 1. The combination, in a dust-collector, of l the collapsible frame made up of sections joined together by suitable tleXible strips, 1 with springs arranged between said sections I and adapted to normally hold the same apart, and a convoluted sieve arranged within said sections and adapted to bar the passage of dust through the opening between the sides of said sections, substantially as described.

:2. The combination, in a dust-collector or bar, of the frames arranged one above the other and connected by flexible strips with pins arranged between said sections and adapted to limit the lateral movement of the same in respect to one another, rods extend- .ing across said sections, sets of said rods being placed, respectively, in opposite ends of said sections, with a sieve-cloth carried alternately over upper and lower rods and secured to the sides of the frames and across said flexible strips, a top for the upper frame,

said top provided with an outlet, a hopperbottom provided in connection with the lower frame and below the lower rods, an inlet-opening in said hopper-bottom,andsprings adapted to hold said sections normally apart, substantially as and for the purpose specified.

3. The combination, with the frames 18 and 19, of the flexible strips 20, adapted to close the opening between the adjacent edges of I said frame and secured to the same, the pins 22 and 23, the top 31, provided with the outlet 32 and adapted to be secured in the upper frame 18, the hopper-bottom 33, provided in connection with the lower frame 19, the springs 2a and 25, adapted to hold said sections apart, the rods 28 and 29, adapted to support the cloth sieve 30, the edges of said cloth being preferably glued to the sides of the frames, and the strips 20 to form a complete bar to the passage of dust from the hopper into the upper chamber beneath the cover 31, and the bar 35, provided across the top of the dust-collector and supported upon the upper frame 18, substantially as described. in testimony whereof I have hereunto set my hand this lOth day of September, 1890. DAVID A. lVARD. in presence oflfJHARLEs ALBERs, .l'oHN W. WETZEL. 

